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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Employee Benefit Plans
EMPLOYEE BENEFIT PLANS

Net periodic pension and postretirement benefit cost for the Company’s defined pension and postretirement benefit plans for the three months ended March 31, 2017 and 2016 are set forth below (in millions):
 
 
Three Months Ended March 31,
Pension benefits
 
2017
 
2016
Service cost
 
$
4.2

 
$
4.1

Interest cost
 
5.0

 
6.4

Expected return on plan assets
 
(8.7
)
 
(10.2
)
Amortization of net actuarial loss
 
3.0

 
2.6

Amortization of prior service cost
 
0.3

 
0.3

Net periodic pension cost
 
$
3.8

 
$
3.2

 
 
Three Months Ended March 31,
Postretirement benefits
 
2017
 
2016
Interest cost
 
$
0.4

 
$
0.4

Amortization of prior service cost
 
0.1

 
—

Net periodic postretirement benefit cost
 
$
0.5

 
$
0.4


 
 
 
 
 

 
 
 
 
 

The following table summarizes the activity in accumulated other comprehensive loss related to the Company’s defined pension and postretirement benefit plans during the three months ended March 31, 2017 (in millions):
 
 
Before-Tax
Amount
 
Income
Tax
 
After-Tax
Amount
Accumulated other comprehensive loss as of December 31, 2016
 
$
(404.8
)
 
$
(100.3
)
 
$
(304.5
)
Amortization of net actuarial losses
 
3.0

 
0.5

 
2.5

Amortization of prior service cost
 
0.4

 
—

 
0.4

Accumulated other comprehensive loss as of March 31, 2017
 
$
(401.4
)
 
$
(99.8
)
 
$
(301.6
)


During the three months ended March 31, 2017, approximately $8.8 million of contributions had been made to the Company’s defined pension benefit plans. The Company currently estimates its minimum contributions for 2017 to its defined pension benefit plans will aggregate approximately $28.1 million.
During the three months ended March 31, 2017, the Company made approximately $0.6 million of contributions to its postretirement health care and life insurance benefit plans. The Company currently estimates that it will make approximately $1.5 million of contributions to its postretirement health care and life insurance benefit plans during 2017.